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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c500b7610c826a8b3fd2bd403e28a010075ede6d38a3215e9716de477c8820' 
  AND token = 'QCLT0wYsuZVoAuimNx9mDzCPF9U+GHM3c10U+2b5dKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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