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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '430c60a9b301774ecc0b93ae34a1b049f50b1783ceb98d8aedfba55b2313e6aa' 
  AND token = '42lhyGBq4d0C5+hD0IaoRBhcieWV8dTh81TnqTGGAdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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