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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2304e2d663e6dbb106cbaa82d02ea4035eb2ec99d065b1b63b6ba2b829fdfd5' 
  AND token = 'qLtEkPH6JV1f+RVAMadgIfBn0P6AX7qjiEXi1vGV4+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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