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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4865fe1c66ed429d2b01c991086976a63c19b238a456dd65758ef6f0ab0a9ac' 
  AND token = 'ceGmSqc62KTii4uA+DQ8uGpXeTqkmk+/nivJvf1Fuik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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