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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6136bce06928461eb5a0b71dea50e41bf94a91ce1868d0bedd7c7cc001baaab' 
  AND token = 'YHpwKYSitsTSZ32k54lPR097kKy2Wlm+W/puvUJyWBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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