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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c3a7ec3f3fa927f951b28414891d79b61abf693ae4f4245a4cb5cf26d52a7a' 
  AND token = 'LoAi3oObaY+jw0Sd/SJcWbFoN5Q+5S/P1jaV6z+k4t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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