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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '785d086df51f609be33ba20a851174dbf7647fa71faf52dbb0f782fcf6c6f956' 
  AND token = 'KL1Wx45wNtFfkdyM80t1k9LCPY7RLQSf6mPlevsqP+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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