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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62c136a3e26d6536f3c6350ebc6113ace2cab586342c689497bb3e4a0349ab3e' 
  AND token = 'n5d2nyGESekuZP6wgr6QeyZMC2l2JJsh49PC+/q20UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00116

JSON explain

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