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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f3e70cd2f24a27bb62a1435bca259fb55cc6bf9cfab6c6e5c0c2a140efbad21' 
  AND token = '1Bh6/o1uxL+nrHV98rGCtwa4Gm6VBpKh2wmSkUdScPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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