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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73825827341ed7748a686cc1e13af2f2584099da3df5729118e9d3bc33bab647' 
  AND token = 'm5YxHobf8Tl3bj9GKG4hHfD5Ok34mPcNaFy0PstRTQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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