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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccea460b39062630a74a09af02fae8b942f5b77476d9a20cef11a2eab4bed5c7' 
  AND token = 'ACNrvW7kr4K/Dxzz95+WwlmbgDZ3sPcCfRe0aSh4sko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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