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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '060b99f2ad4fc358c61a4d8d223724be6078724f6b8726c037b69867093945ef' 
  AND token = 'w3OVbuJRN6vMNqHV9FRXTzGb5naYAc2i0rscraHsdgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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