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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca44cca11e2de75dd4412093748d0896284a995af1bbd1773e0ea68f2178439f' 
  AND token = '8AmsaTdR3ClY/80Dnktl7F9ktoCw8sCdXpWyFr88vSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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