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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ded19675738c2c95507d72d40270431d02401e08cc85f0d8f9d9894cec8c3b92' 
  AND token = 'OMgav43ShVkqrgdF4jBf+HER+EocaoZhrg49j3AKUjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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