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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa8f366d2ab5339ab37c464dcf10d403d53f62fb8b68963742ce2b9366b9f2a4' 
  AND token = 'gzIt3OjY11kXoUf1tkuROS2j+rP5IfzQiE+GEPf723A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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