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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7741a8c7a0fcc41b410bd9f715b0d43eab6bd4f482f488f871b4e293a04d4b0' 
  AND token = 'zAWpZ0XrXTUudU6K76JguHCMGOCezc0IQ2Yo3YM95N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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