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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '362a657486e8a537395ecc5a6022b3a5a35dbd3261821ffdf96281d52168ae51' 
  AND token = 'sUV58NK4bdLUZjw8l4J/6L6N67q3OyrJO1eIGuVYMbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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