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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f019a09e9189d9d0d4fba2d3d8be9ff0fa4bf732c4e5a80ab20cbd893be8c540' 
  AND token = '5s9R440Dt2nAUgyrPvkgfzzkmiFbjjYUdgK6uDD7Y+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}