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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99bc0e5b0dfe89a5e30fc47e45f1733494413e172c3f6f6df47b393a726f236a' 
  AND token = 'P7uLdCAPktQrTrHH+0Fb8RylNHvp/byQ0cbeG5aw8UI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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