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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87f8552cf4258250fd889c8c1d77da68f231056b0df0795afa8d161aa15a2de3' 
  AND token = 'xPn7wYqtk65/cIXX3UHUFd4umf3dletycNUxbwweDXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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