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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3bbbac28c17c4ab11326d505d149c400f457c13f31d52e167992aca0f0279b9' 
  AND token = 'H2Eut0ht9JgTeUOyqenszsGc5/CIDvFtg1RMj6013IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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