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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '013318409e46a72d3aad5ab121647fceca72444ee8d2de45c459a7ddf1dc5e9b' 
  AND token = 'QoLT5N5ifwln1UuwTnF+k0/DUs6Qhsos6aEGEoDiLxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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