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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b207a4ea8f40290a139ed16485d1e646c9a587fc6ab46be870eb57f9ed96c1e' 
  AND token = 'N6LvXg8JeEbMnv+PfJWFYhkQNEf2BoFGemE19NCr4kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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