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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6da5660a668250394443721e1b2fcd3664f1d93934279477292449cf02a6c2a' 
  AND token = 'K2nitunXpYpt5hx7ssqFixpMBeuMFJCdPrbl117Fb/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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