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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aae18891bcc7d1a03503bd5f9da57d4bffebbab2ac4d1a9166bf82db9eefa8b2' 
  AND token = 'llOE0A/gdGWKzOJH0hLBh9JzlhcyqH9zWx3/RMYyAMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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