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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c142b838736b547456747616c1b6941a6cac0ac15ee781f025799265ae4be47' 
  AND token = 'v2SGGeb10WP+Zr/kxXr1Efskn4kh5AenF82rR0Ypoq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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