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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e91b06d6cbaa6f7d288d9bdc5bf865f0daed058719e538c1e804c314ba036d' 
  AND token = 'YepHPnlsLgkeCL6JLAo8IxelM2N0LTdbsgpOwlLu+38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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