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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4d3fa9abeb4a80f7946ec14c39f0c0e7c1c45a1733e6ca6573b6c0d8e8dd45e' 
  AND token = 'yrKQSZSWEf85DntKgOTB+6ohkl9fYoPZ8EPLZOEuLfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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