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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dfbe882a78eeb97128e56a4115c672ffd3fd7a7553a2ef3929a18f4d738ab51' 
  AND token = 'BD173MXLJWWadlP75WrIo29bXg+UTPTZqJm1K5Xtk5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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