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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d9f23547ecd880ca0d64038e6985293be7ca867b820ba14b117c2037d886ee' 
  AND token = 'EpSru2mMRJl+up1cY6/lkI5Y+1uUeec4HOcDXBVtE+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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