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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c53484a152f9a06148b25b0d99904dc371945f127de7c0193065f7cea7296430' 
  AND token = 'ploZnu/gVjhnmg4YZNFNalcLE7MzxuxW9vae2Dix8Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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