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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87801b6e9770ce0e005b3aec4290d4f2206fa3e4d8c1fdc22783a9f93a33964c' 
  AND token = 'QIAj9Ypr40tu0uZBxhPLtokqYeKWzkedjT/xI8oFoEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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