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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '902ea08c6adb881a93796fe78f0dd49e029ccb00415935c88b9512f8836d35bc' 
  AND token = '4AkdNu72ZSlqe1d/fo42hKKrhArr2LPF4jccXcUXIbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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