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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2acf78143297a58910a327330b8e236920a574ccff162fe710f474474a3ca446' 
  AND token = 't+0d3X/EV+LPdr1qBXN+D3J/3Fwd4Ul4R9ayhdXUvJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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