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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c9634f7996358c14c98b249df48e109e28e3f70176deb986b918096406db88b' 
  AND token = 'W7waAO/J/neh+b1W4G8AsnoutfhBzV0lF5a5WQwXAAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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