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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dbae0689a0521f6f73825e917a09ef37de9b72ff3bfb5871fb442f30792109a' 
  AND token = 'KfwWeEU9G/dO5i4FDauSVs3ydHJSUQkc++M1O6aAIm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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