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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd19d213fa550469a1a569d7a2ea0f0920fb0203519bf9e4031c18ceb9f6715' 
  AND token = 'be8U9aBEMVxe1ggVTf9nOYmV9lPg0KGMn0XfhOk6gNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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