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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ffb5e461b128458c37b694ea8162be502d64bcf35844b8f3cb0be5ab182fee6' 
  AND token = 'ZEBRWYrdpe3G95spVwfUS2uvkDhqSouPOI4jEIk+wps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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