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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74c3f256aec44d323c9b5711b2cfd13ec108ce63844eb71624ad3345d770d4fe' 
  AND token = 'BxxTCTroj3ljuNrlU+tU0+UY4h26mtck3skpFjviYVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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