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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '983ee606d1e1aabb267674484c9b1da01122889829710d9d2259a65288839016' 
  AND token = 'Cc2yoOt3Huq2EjqLDROaofSkEMTUm3amjkhae5EdInE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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