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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee4202bfd9f1bd0d605d15db58b2887a6d347d802e04b28dd4bf2e14c3db6e6f' 
  AND token = '2+jPqK7h1i4APK+HyPROFbWfOEReLj63WSAM1IO3JLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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