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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da779df8de203d7f160951c9ef673ab21e30a72494f20f59417eca118015572c' 
  AND token = '23mTrycPU/fOO4jkzkKIcDkDHnwcx4/kJWcK1i1RwX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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