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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28d49c9431d82ed2c8da2e74717064d823b0772b3197f1bd6e011ce3972a4a21' 
  AND token = 'rp/bBYgesDf/lpiiM4FJXV52SaDI/9HF9hbLqVNfoUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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