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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c20e257b59f8a35d93a25e131f573c36440c47adcfe0555bbbd4172d9cfda17f' 
  AND token = 'f7k+YGa1cvovTd4HpzUqLMGNTBjjgW2QdWogNfvsS5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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