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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aca01ddc68cea359c27a7849973ede09a528384424adc66aa306bdb02f173d52' 
  AND token = 'FMj0PL8j8iyc5z+jZmSfPB8PsiiotjvVgaQaDpK8HR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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