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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daafa01a29fbc96a0e695d4d8808ca5a5e90ee5fdef57c432afeb1f3940935e3' 
  AND token = '3DlKZsacAcPSXgqCtiBrAHWnmg5LAnzK0J6YirZ93lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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