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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e92860f910fbb4eeac9f9d94ba04523edae869efad8d8c79683eecfc465d1e41' 
  AND token = 'FbJUu5DAlGGNoVagGMDMBv85wxPj+bBYkAJ0FBfk0rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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