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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2568c5eddeccd749aa705a7437f54e6d20fefc60b0408e8c50eedfe21ff51bee' 
  AND token = 'ic5eOw9T8KQsMk/oFDbeZFaqGwEgp94avVu/4Mi9SpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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