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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20122231ec69447b0b3ef8a801bc2115dc7495df47729f4193581bcf1dc12443' 
  AND token = '9cXZMo7ZupX1jkXtwT3AKbFsunv2Et8MntxM6qD0uZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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