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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8626d9480ce59a9651965f57fbe0a7de489a31b569c0b9a9402fae07ef9803' 
  AND token = '+VmapNtLg+8meU6PjFyICTA3t2ohHGtu3UyjI/gmirg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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