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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db3c8c5b4dfdc56e6920f224bef14116375f04ec48deb0869b32849e27ede1c7' 
  AND token = '8/g6mkpaYRqBcum0FiZHL7H74utbP8JHBdYAc77eR7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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