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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '765f4e966d10420f96f758d600c4f7d79a3fa2abd6b9911a558638a8dbff1c1d' 
  AND token = 'GKGoZPEN6fZIbbApdL02Yav3gHFias3b2dNqc/KdJpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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