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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60ddc1456e7e761b81b171172b3abb7858794fa8dda1245c1f047a46523efc54' 
  AND token = 'MDzTvIqR263c2iNAG8/nqx9B2xtZsmmmQzjnhtr1b/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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