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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '371e77d4680fd71e51be1b3526cf5cf316b3182cf3436bb18530a335434b385f' 
  AND token = 'vbc/FyLqmExmOhfhxQ085pMPdrKQdcSvFPpX6TCmrKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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