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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b0829d26d51629b5c1c7c06845d6a6e676f037648982985fabdcd311ba2d14' 
  AND token = 'h9/53axu2ARPecH9wn64wnZ+kiFon9qt6Afys6xeEhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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