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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e844992e573362f2b851e89d3448661dbbac443442f85f3381777e5f1dc08c61' 
  AND token = 'ik9oSR5GS10QZPiiBfQTjCzH+CqrvFdP+csx1a8hOxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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