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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea37fa1e7c4f4c22dce8e7ad39b826f0919c942ef3421bbdb4159758a58f3198' 
  AND token = '5BU4wdz2arsqX7ie/I17y094+YPFm1Ao9U+qiAhkHYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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