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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb05118626b5f79cea453c4e6e0deb844718fef83b14834fdbf862709bee7bd3' 
  AND token = 'LUkpqrYp8v74BFkVA94H+sMo6RRI6krhb8jutPj7O3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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